/* Copyright (c) 2009, Markus Peloquin <markus@cs.wisc.edu>
 * 
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#ifndef FLUKS_UTIL_HPP
#define FLUKS_UTIL_HPP

#include <cstddef>
#include <tr1/cstdint>

namespace fluks {

/** XOR two buffers together.
 *
 * \param[in] a	The first operand.
 * \param[in] b The second operand.
 * \param[in] sz	The size of the buffers in bytes.
 * \param[out] c	The output buffer.  It can safely be the same as
 *	<code>a</code> or <code>b</code>.
 */
inline void	xor_bufs(const uint8_t *a, const uint8_t *b, size_t sz,
		    uint8_t *c);

/** XOR each byte of a buffer with a single byte.
 *
 * \param[in] a		The buffer
 * \param[in] sz	The size of the input/output buffers
 * \param[in] b		The byte to XOR with the first buffer
 * \param[out] c	The output buffer.  It can safely be the same as
 *	<code>a</code>.
 */
inline void	xor_buf_byte(const uint8_t *a, size_t sz, uint8_t b,
		    uint8_t *c);

inline void
xor_bufs(const uint8_t *a, const uint8_t *b, size_t sz, uint8_t *c)
{	while (sz--) *c++ = *a++ ^ *b++; }

inline void
xor_buf_byte(const uint8_t *a, size_t sz, uint8_t b, uint8_t *c)
{	while (sz--) *c++ = *a++ ^ b; }

}

#endif
